RB-PEG-SH (MW 2000) (Rhodamine B-PEG-SH (MW 2000)) is a fluorescent dye comprised of Rhodamine B, PEG, and a thiol (SH) group. The highly reactive SH can form stable thioether bonds with various functional groups, such as maleimide, exhibiting excitation/emission spectra of 546/610 nm.
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